Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33ccfbae049c19f…

MALICIOUS

PDF

95.5 KB Created: 2021-09-19 12:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9ab852d476af6b7e4357d07f7a5acc40 SHA-1: 1c8cc9e9e3f8b6e3a558a248befb1e5d5acf45d4 SHA-256: e33ccfbae049c19f69ac2c3b001e766a1d55cd3a078259f5e08f2ff88997b205
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and numerous external links, many hosted on compromised WordPress sites. The primary URL suggests a lure related to 'flash game hacker' to entice users to click, likely leading to a malicious payload download or phishing page. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://irlanc.ru/uplcv?utm_term=flash+game+hacker PDF link annotation
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a193bad66---42278605282.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/65806308826.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/92244793854.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/8bf6ae319c3f41b011a82e85f9019892/besofetuwuparemiwonepar.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/45285582639.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62393043038.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/kiwurusonifitufoled.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614050112abc9---78561469599.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210905023323.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/2018529518.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/0197ae49960980080bb0584f7558f0a4/kixusubosetina.pdfIn PDF document text
    • https://777mto.org/contents/files/buterujizuwowububekubexo.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161466fe41be68---warufexexiner.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/wikejojokegitidirixugev.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/80955247054.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/68906514429.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/rorarinonapuxup.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/lamoxuzajox.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/9014403757.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/34627776436.pdfIn PDF document text
    • http://lj-group.cn/upload/files/26041165826.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/jebujizititawimikemiwifet.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401a7bc52b9---xawaboboxolojalode.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/vepuxu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC9 17580 bytes
SHA-256: ea2459d1e5cd5174519e7aba4312eab8a04bd5b6dd1cad35576ec5c90bd43054
font_02_sfnt_off000158f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158F7 10332 bytes
SHA-256: 6849262db68a484b611e6b8949b6e01b73e22d4cbb7204327b34391cb74ded30

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